[SOLVED] Electrons movemnt from Base to Collector in NPN transistor

[tahir4awan]

Electrons movement from Base to Collector in NPN transistor

What causes the electrons to move from base to collector in common emitter configuration. It is said that base is very thin so few electrons from emitter region will diffuse into base and rest of the electrons will move to collector region.
If the purpose of the thin base is only that then what is the function of positive supply at base?

 

[Syncopator]

Re: Electrons movement from Base to Collector in NPN transistor

What causes the electrons to move from base to collector in common emitter configuration.

There are two currents in a transistor, the base/emitter and the collector/emmiter. I don't think it helps much to think of electrons and/or holes, just think of currents.

... what is the function of positive supply at base?

The base-emitter junction has to be forward biased, so the base needs to be positive with respect to the emitter on an NPN.

 

[kak111]

I made a small info for you..........

View attachment Transistor_electr.pdf

what is the function of positive supply at base?

It makes electrons move over the diode BE
ie when voltage is high enougth to put diode to conductive state electrons can flow
over NP (EB) junction. (Si-BJT voltage BE is about 0.7V)

Regards KAK